Select the image layer and choose File > Export > Canvas Image/Mask Layer .
After you have created
a sketch, you may want to export it as an image file.
NoteYou
can export an image layer in 32 bit BMP format, so that the image file
contains four channels (RGBA), or in 24 bit BMP format, so that
the image file contains three channels (RGB). Many graphics applications
cannot read 32 bit BMP files. In these cases, export the image layer
in 24 bit BMP format or use the imgcvt utility
to convert the 32 bit BMP file to a 24 bit BMP file.
To export an entire canvas
plane, you need to use File > Export > Make Canvas Picture .
See Export a canvas plane.